I have an iMac (27-inch Late 2009) Model A1312 (EMC 2374) and would like to replace the broken optical drive with an SSD and upgrade the HDD. I have the iFixit instructions for the job itself but would like to confirm that I'm using the correct parts. My HDD is ST31000528AS which is a Seagate Barracuda drive, I understand that I can replace this drive with a similar Seagate Drive, e.g. a 4TB Seagate Barracuda Desktop HDD.15 and won't have any problems wrt fan control, is that correct? I want the drive to not be a "green" drive, i.e. to have a fast spin-up, the delay in randomly spinning up my external drives, drives me crazy. For the SSD, I'll buy the iFixit kit and was thinking of either the Crucial BX100 or the Samsung 850 (Both 1TB). Any help will be greatly received. Thanks in advance. Edit : Would the SEAGATE Constellation ES.3 be a better option?